noun
(in Britain) a piece of information known only to the government and its employees, which it is illegal for them to tell anyone under the Official Secrets Act
noun
(in Britain) a piece of information known only to the government and its employees, which it is illegal for them to tell anyone under the Official Secrets Act
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005